6. UMTS
Universal Mobile Telecommunications System (UMTS)
UMTS is an upgrade from GSM via GPRS or EDGE
The standardization work for UMTS is carried out by
Third Generation Partnership Project (3GPP)
Data rates of UMTS are:
144 kbps for rural
384 kbps for urban outdoor
2048 kbps for indoor and low range outdoor
Virtual Home Environment (VHE)
7. UMTS Frequency Spectrum
UMTS Band
1900-2025 MHz and 2110-2200 MHz for 3G transmission
In the US, 1710–1755 MHz and 2110–2155 MHz will be used
instead, as the 1900 MHz band was already used.
8. UMTS Architecture
Mobile Station
MSC/
VLR
Base Station
Subsystem
GMSC
Network Subsystem
AUCEIR HLR
Other Networks
Note: Interfaces have been omitted for clarity purposes.
GGSN
SGSN
BTS
BSC
Node
B
RNC
RNS
UTRAN
SIM
ME
USIM
ME
+
PSTN
PLMN
Internet
9. UMTS Network Architecture
UMTS network architecture consists of three
domains
Core Network (CN): Provide switching, routing and
transit for user traffic
UMTS Terrestrial Radio Access Network (UTRAN):
Provides the air interface access method for user
equipment.
User Equipment (UE): Terminals work as air
interface counterpart for base stations. The various
identities are: IMSI, TMSI, P-TMSI, TLLI, MSISDN,
IMEI, IMEISV
10. UTRAN
Wide band CDMA technology is selected for UTRAN air interface
WCDMA
TD-SCDMA
Base stations are referred to as Node-B and control equipment for Node-B
is called as Radio Network Controller (RNC).
Functions of Node-B are
Air Interface Tx/Rx
Modulation/Demodulation
Functions of RNC are:
Radio Resource Control
Channel Allocation
Power Control Settings
Handover Control
Ciphering
Segmentation and reassembly
11. 3.5G (HSPA)
High Speed Packet Access (HSPA) is an amalgamation of two
mobile telephony protocols, High Speed Downlink Packet
Access (HSDPA) and High Speed Uplink Packet Access
(HSUPA), that extends and improves the performance of existing
WCDMA protocols
3.5G introduces many new features that will enhance the UMTS
technology in future. 1xEV-DV already supports most of the
features that will be provided in 3.5G. These include:
- Adaptive Modulation and Coding
- Fast Scheduling
- Backward compatibility with 3G
- Enhanced Air Interface